The ABB SACE Isomax S5N molded‑case circuit breaker is a 400 A, 4‑pole, 600 V AC protective device that uses the PR211 electronic trip unit for long‑time and instantaneous overcurrent protection. It provides an Icu up to 35 kA at 415 V and an Iu of 400 A at 40 °C, making it suitable for feeder protection in low‑voltage distribution panels. The 4‑pole design often includes load‑side lug terminals and is suitable for reverse‑feed configurations, offering robust protection for industrial electrical systems.
